Denwa no Akuma

"I am your attendant, your steward, your loyal servant."

A demon who contacts the protagonist. Exists solely as a voice on the phone. A facetious blabbermouth of a masochist.

Her mission is to lure the protagonist down the path of the demons, but for all her harassment, she doesn't seem too determined to achieve that goal. She and the protagonist would make an amazing comedy duo.